Originally posted by bkb500 ...........
As far as shaving the case halves; I'd be nervous about all the other ramifications like intermediate shaft bosses, piston clearance, and I'm not sure what else.

The machine shops that resize these cases take all of your concerns into account. [Remmeber we're talking about a few thou not a 1/4 inch.]
We do and I'm certain the Competition Engineering and Ollies do to.
If you have a favorate machine shop that specializes in Porsche machine work, just ask.